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Metabolic
Fasting Insulin
Insulin levels after fasting — one of the earliest indicators of insulin resistance, years before glucose rises.
Optimal Range
2-6 μIU/mL (optimal) · < 10 μIU/mL (normal)
Why It Matters
Fasting insulin rises years before glucose in the progression toward type 2 diabetes. It is one of the most actionable early metabolic warning signs and responds readily to lifestyle interventions.